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Finding the Fourth Proportional to 1,661.21, 2,292.53 and 915.22

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Solution

The fourth proportional to 1,661.21, 2,292.53 and 915.22 is: 1,263.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.21 : 2,292.53 = 915.22 : x
  2. Step 2: Convert to fraction form
    1,661.21/2,292.53 = 915.22/x
  3. Step 3: Cross multiply
    1,661.21x = 2,292.53 × 915.22
  4. Step 4: Simplify right side
    1,661.21x = 2,098,169.31
  5. Step 5: Solve for x
    x = 2,098,169.31/1,661.21
  6. Step 6: Final answer
    x = 1,263.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.